Huge Load Delays

It's taking a full 45 seconds to finish loading a thread (doesn't happen with menus). After clicking on a thread the first half of the firs posts load almost immediately, then something is waiting 45 seconds (yes I timed it with my watch) before the remainder of the information is loaded and displayed. This occurs consistently on every thread on every board, and I noticed the problem just this morning. Something happened in the past 7 hours.